y = 2x+5
x+y = 4
Substitute the value of y into the second equation:
x+2x+5 = 4
x+2x = 4-5
3x = -1
Divide both sides by 3 to find the value of x:
x = -1/3
Substitute the value of x into the original equations to find the value of y:
x = -1/3 and y = 4 and 1/3
To find what times 4 equals something, you need to divide that "something" by 4. For example, if "something" is 20, then you would calculate 20 ÷ 4, which equals 5. Therefore, 5 times 4 equals 20. This method can be applied to any value of "something."
That depends what either the value of a or the value of b is.
Solve this simultaneous equation by the elimination method: x+y = 12 x-y = 4 Add both equations together: 2x = 16 Divide both sides by 2 to find the value of x: x = 8 Substitute the value of x into the original equations to find the value of y: Therefore: x = 8 and y = 4
2
That would be 10
To find what times 4 equals something, you need to divide that "something" by 4. For example, if "something" is 20, then you would calculate 20 ÷ 4, which equals 5. Therefore, 5 times 4 equals 20. This method can be applied to any value of "something."
18
That depends what either the value of a or the value of b is.
7
7
Divide the percentage by 100 and that is the value.
c7
Solve this simultaneous equation by the elimination method: x+y = 12 x-y = 4 Add both equations together: 2x = 16 Divide both sides by 2 to find the value of x: x = 8 Substitute the value of x into the original equations to find the value of y: Therefore: x = 8 and y = 4
2
5s = 0
That would be 10
distance and time