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This is just a matter of substitution. The original problems tells you what x is, x = -2. And your equation is y = -7x + 2. So everywhere you see x, you need to substitute it with -2. Then you can carry out the operation and solve for y. So, let's begin!
y = -7x + 2
Substitute x.
y = -7(-2) + 2
x is being multiplied by -7, so that is what you will do with -2. Now simplify.
y = 14 + 2
Multiplying two negatives numbers, give you a what? A POSITIVE!
y = 16
Always check your work.
16 = -7(-2) + 2
16 = 14 + 2
16 = 16
YAY!! YIPPEE!!
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4x plus y equals 9 7x - 8y equals 6?
(2, 1)
If x equals 2 and y equals 9 then 7x plus 3y equals?
7x+3y where x=2 and y=9 can be written as (7*2)+(3*9) which can be simplified to (14)+(27), from there it's basic addition.
What is the solution to the equations y equals 3x plus 4 and y equals 2 -7x showing key stages of work?
If: y = 3x+4 and y = 2-7x Then: 3x+4 = 2-7x So: 3x+7x = 2-4 => 10x = -2 => x = -1/5 By substitution: y = 17/5 Solution: x = -1/5 and y = 17/5
Is y equals 3x2 -7x plus 2 an up or down parabola?
It is an up parabola.
What is y equals x2 plus 7x plus 4 in vertex form?
You can get it to vertex form by completing the square: y = x2 + 7x + 4 ∴ y = x2 + 7x + (7/2)2 - (7/2)2 + 4 ∴ y = (x + 7/2)2 - 49/4 + 16/4 ∴ y = (x + 7/2)2 - 33/4
