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Q: If y = 5x โ 8 find the value of x if y = 7?

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The value of x is: x=7/8. Work: 5x-3=4-3x +3 +3 ________ 5x=7-3x +3x +3x ________ 8x=7 /8 /8 ________ x=7/8

you just equal that equation to 0, then you solve for x 5x-8=0 5x=8 x=8/5

It is: 8-5x simplified

5x=4012y=84124

5x+8=6 5x=6-8 5x=-2 x=-0.4 Absolute value of -0.4=0.4

5x+3y = 51 y = 10x-8 Substituting the bottom equation into the top equation: 5x+3(10x-8) = 51 5x+30x-24 = 51 5x+30x = 51+24 35x = 75 Divide both sides by 35 to find the value of x: x = 75/35 = 15/7 in its lowest terms. Substitute the value of x into the original equations to find the value of y: So: x = 15/7 and y = 94/7

When x equals 8, the value of 5x would be 5 times 8, which is 40.

5x - 8 = 7 Add 8 to both sides 5x = 15 Divide both sides by 5 x = 3

40

It's a simple linear equation in 'x'.There's only one numerical value of 'x' for which it's true.If you want, you can find that value like this:3x + 7 = 71 - 5xSubtract 7 from each side:3x = 64 - 5xAdd 5x to each side:8x = 64Divide each side by 8:x = 8

If 5x + 8 = -7 then x = -3 ! -3 x 5 = -15 -15 + 8 = -7 !

That depends on the plus or minus values 0f 8, 5x and 7 which have not been given

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