Which of the following has infinitely many solutions? 5x−10=x+20

10x+5=3(5x+7)

2(4+x)=8+2x

2(6+x)=14+2x

Compare the subtraction problems 6/8 - 5/8 = 1/8 and 6/9 - 7/9 = 1/9 why is the answer to the first problem positive and the answer to the second problem negative

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0